Side punching mechanism with movable guide block

ABSTRACT

A side punching mechanism with a movable guide block includes a slider base disposed in a lower die. A slider is disposed on the slider base, a side punching pin is disposed at a front end of the slider, a movable guide block connected to the slider base in a sliding fit manner is disposed in front of the slider, the movable guide block includes a concave movable base and a boss disposed on the movable base, a front end of the boss protrudes forwards and extends out from the movable base, the front end of the boss has a shape of an indented arc, the boss is disposed at the center of the movable base, a through-hole is formed in the boss, and the slider slides on the slider base along a concave space of the movable base to drive the side punching pin to move in the through-hole.

TECHNICAL FIELD

The present invention relates to the technical field of die machining, and in particular, relates to a side punching mechanism with a movable guide block for a product with a relatively small side hole and a few flanges at an opening.

BACKGROUND

For a deep drawing product with a side hole produced on a multi-station deep drawing press, especially a product with a small hole in a side wall and a few flanges at an opening, the side hole of such a product is usually formed by using a side punching mechanism shown in FIG. 1. A cutting edge 1 is fixed to the middle of a lower fixing plate. A product 4 is pressed into the cutting edge 1 by an upper ejector rod for product positioning. A slider is fitted into a spring and then mounted into a slider base 2 to reach a sliding fit state. A punching pin guide block 21 is fixed in a dovetail groove of the slider base in a close fit manner. A punching pin 3 is fixed in the slider. The punching pin guide block 21 guides a punching pin head. During die closing, a slider-pushing punch descends along with a floating plate and reaches contact with an inclined face of the slider, to drive the punching pin 3 to move forward and enter the cutting edge 1 for side punching.

However, as the product has a few flanges 41 at the opening, to avoid the flanges 41 of the product from interfering with the guide block 21, the guide block 21 must keep a certain distance from an outer edge of the flanges 41 to give room for smoothly ejecting out the product and allowing the product to enter a lower die. In other words, when the punching pin 3 punches a hole, the punching pin head is suspended and loosened. In addition, as the product has a small side hole, the punching pin head is easily broken in case of no protection. Moreover, the product cannot be pressed from the outside due to its thin wall, and consequently the product may be subject to flanging deformation at an edge of the hole after punching.

SUMMARY

To overcome the defects in the prior art, the present invention provides a side punching mechanism with a movable guide block, which can protect a punching pin head and press an outer part of a product to better perform side punching.

The objectives of the present invention are achieved by the technical solutions below:

A side punching mechanism with a movable guide block includes a slider base disposed in a lower die, where a slider is disposed on the slider base, a side punching pin is disposed at a front end of the slider, a movable guide block connected to the slider base in a sliding fit manner is disposed in front of the slider, the movable guide block includes a concave movable base and a boss disposed on the movable base, a front end of the boss protrudes forwards and extends out from the movable base, the front end of the boss has a shape of an indented arc, the indented arc fits with an outer-surface arc of a product, the boss is disposed at the center of the movable base, a through-hole for the side punching pin to enter is formed in the boss, the slider slides on the slider base along a concave space of the movable base to drive the side punching pin to move in the through-hole.

Preferably, the movable base includes two L-shaped bent side wings disposed at the bottom of the boss, and the side wings each are bent into an L shape towards the slider to enclose the concave space.

Preferably, an inclined face is disposed at a rear end of the movable base.

Preferably, a return through-hole is formed in the movable base, a spring is disposed in the return through-hole, one end of the spring abuts against a cutting edge, the end abutting against the cutting edge of the spring is positioned below a flange of the product, and the other end of the spring is disposed in the slider and configured to coordinate in returning the slider.

Preferably, the return through-hole is positioned under the boss.

Preferably, the inclined face of the movable base is mated with an inclined face of a side-push inclined punch fixed to a floating plate, and the side-push inclined punch is disposed in an inner/outer splitting manner and includes an inner-side-push inclined punch and an outer-side-push inclined punch wrapping around the inner-side-push inclined punch.

Preferably, an inclined face of the outer-side-push inclined punch is mated with the inclined face of the movable base.

Preferably, an inclined face of the inner-side-push inclined punch is mated with an inclined face of the slider.

Preferably, a distance by which the boss extends out from the movable base is greater than a width of the flange of the product.

Preferably, a counterbore is formed in each of the side wings, and a linear spring is disposed in the counterbore.

The present invention has the following beneficial effects: With a protection section provided for a punching pin head, the punching strength and side punching stability of the punching pin are improved. In addition, a part of a side wall of the product around a small hole is pressed, and this can effectively mitigate the defect of flanging deformation of the small hole in case of no pressing.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic diagram of a side punching structure according to the prior art of the present invention;

FIG. 2 is a schematic diagram of a structure according to the present invention;

FIG. 3 is a schematic diagram of a stereo structure according to the present invention;

FIG. 4 is a schematic diagram of a stereo structure from another perspective according to the present invention; and

FIG. 5 is a schematic diagram of a use structure in a die according to the present invention.

DESCRIPTION OF EMBODIMENTS

The technical solutions of the present invention are described in detail in combination with the embodiments below. The present invention discloses a side punching mechanism with a movable guide block. As illustrated in FIG. 2 and FIG. 3, the side punching mechanism includes a slider base 14 disposed in a lower die. A slider 13 is disposed on the slider base 14. A side punching pin 12 is disposed at a front end of the slider 13. The side punching pin 12 may be a splittype to better adapt to product punching. During assembling, the side punching pin 12 may be mounted into the slider from a rear end of the slider 13.

A movable guide block 15 is further disposed on the slider base 14 in a sliding fit manner. The movable guide block 15 is disposed in front of the slider 13. The movable guide block 15 includes a concave movable base 151 and a boss 152 disposed on the movable base 151. A front end of the boss 152 protrudes forwards and extends out from the movable base 151. The front end of the boss 152 has a shape of an indented arc. The indented arc fits with an outer-surface arc of a product 10. Therefore, when the product 10 is being punched, the front end of the boss 152 can press a punching area of the product 10, to prevent the material from flanging deformation during punching. In order not to affect the placement of the product, a distance by which the boss 152 extends out from the movable base 151 is greater than a width of a flange of the product.

The boss 152 is disposed at the center of the movable base 151. The movable base 151 includes two L-shaped bent side wings disposed at the bottom of the boss 152. The side wings each are bent into an L shape towards the slider to enclose a concave space. A through-hole for the side punching pin 12 to enter is formed in the boss 152. The slider 13 slides on the slider base 14 along the concave space of the movable base 151 to drive the side punching pin 12 to move in the through-hole.

An inclined face is disposed on an upper portion of a rear end of the movable base 151. A return through-hole 153 is formed in the movable base 151. The return through-hole 153 is positioned under the boss. A spring is disposed in the return through-hole 153. One end of the spring abuts against a cutting edge 9. In order not to interfere with the flange of the product, the end abutting against the cutting edge of the spring is positioned below the flange of the product. The other end of the spring is disposed in the slider 13 and configured to coordinate in returning the slider 13. In order to provide return force for the movable guide block 15, a counterbore 154 is formed in each of the side wings, and a linear spring is disposed in the counterbore.

The inclined face of the movable base 151 is mated with an inclined face of a side-push inclined punch 11 fixed to a floating plate 4. The floating plate 4 is disposed on a lower die holder 2 through a floating bolt assembly 17. The side-push inclined punch 11 is disposed in an inner/outer splitting manner and includes an inner-side-push inclined punch 111 and an outer-side-push inclined punch 112 wrapping around the inner-side-push inclined punch 111. An inclined face of the outer-side-push inclined punch 112 is mated with the inclined face of the movable base. An inclined face of the inner-side-push inclined punch 111 is mated with an inclined face of the slider. The side-push inclined punch 11 is connected to the floating plate 4, i.e., the side-push inclined punch 11 is pressed and locked by a plug screw locked into a side face of the floating plate 4.

The following describes the principles of the present invention during actual use in a die with reference to FIG. 5.

The product 10 is fed into the cutting edge 9 through a split feeding fixture 5. During die closing, an upper ejector rod 6 fixed to an upper fixing block 7 is used to press the top of the product. The upper fixing block 7 is in contact with the floating plate 4. The floating plate 4 drives the side-push inclined punch 11 to press down. The inclined face of the side-push inclined punch 11 is in contact with the inclined face of the slider 13 and that of the movable guide block 15, so that the side-push inclined punch 11 pushes the slider 13 and the movable guide block 15 to move on the slider base 14 towards the product 10. After the boss 152 is in contact with the product, the product is limited to keep moving forward under the action of the movable base 151. At this moment, a to-be-punched position of the product 10 is pressed by an arc-shaped front end face of the boss 152. The slider 13 continues to move forward under the action of the side-push inclined punch 11, so as to drive the side punching pin 12 to pierce into the product 10 for side punching.

During die opening, the floating plate 4 and the upper fixing block 7 return to original positions, so as to drive the side-push inclined punch 11 to ascend. The slider 13 and the movable guide block 15 successively return to original positions under the action of the spring until the movable guide block completely recedes from the product. The punched product is ejected out by a lower ejector rod 1 of the die.

The present invention is simple and compact in structure. The two sliding parts move independently without interfering with each other and do not affect the guiding-in and ejecting-out of the product. An elastic-pressing effect of a progressive die is implemented with the simple and practical structure, and the quality of the product is improved.

In the description of the present disclosure, it should be noted that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer”, etc. are based on the orientations or positional relationships shown in the accompanying drawings and are merely for ease in describing the present invention and simplifying this description, but not to indicate or imply that an indicated device or element must have a particular orientation and be constructed and operated in a particular orientation, and thus they should not be construed as limitations on the present invention.

Certainly, the present invention further includes many specific implementations that are not enumerated herein. The technical solutions formed by making equivalent replacements or equivalent modifications all fall within the protection scope of the claims of the present invention. 

What is claimed is:
 1. A side punching mechanism with a movable guide block, comprising a slider base disposed in a lower die, wherein a slider is disposed on the slider base, a side punching pin is disposed at a front end of the slider, a movable guide block connected to the slider base in a sliding fit manner is disposed in front of the slider, the movable guide block comprises a concave movable base and a boss disposed on the movable base, a front end of the boss protrudes forwards and extends out from the movable base, the front end of the boss has a shape of an indented arc, the indented arc fits with an outer-surface arc of the product, the boss is disposed at the center of the movable base, a through-hole for the side punching pin to enter is formed in the boss, the slider slides on the slider base along a concave space of the movable base to drive the side punching pin to move in the through-hole, the movable base comprises two L-shaped bent side wings disposed at the bottom of the boss, and the side wings each are bent into an L shape towards the slider to enclose the concave space.
 2. The side punching mechanism with a movable guide block according to claim 1, wherein an inclined face is disposed at a rear end of the movable base.
 3. The side punching mechanism with a movable guide block according to claim 1, wherein a return through-hole is formed in the movable base, a spring is disposed in the return through-hole, one end of the spring abuts against a cutting edge, the end abutting against the cutting edge of the spring is positioned below a flange of the product, and the other end of the spring is disposed in the slider and configured to coordinate in returning the slider.
 4. The side punching mechanism with a movable guide block according to claim 3, wherein the return through-hole is positioned under the boss.
 5. The side punching mechanism with a movable guide block according to claim 2, wherein the inclined face of the movable base is mated with an inclined face of a side-push inclined punch fixed to a floating plate, and the side-push inclined punch is disposed in an inner/outer splitting manner and comprises an inner-side-push inclined punch and an outer-side-push inclined punch wrapping around the inner-side-push inclined punch.
 6. The side punching mechanism with a movable guide block according to claim 5, wherein an inclined face of the outer-side-push inclined punch is mated with the inclined face of the movable base.
 7. The side punching mechanism with a movable guide block according to claim 6, wherein an inclined face of the inner-side-push inclined punch is mated with an inclined face of the slider.
 8. The side punching mechanism with a movable guide block according to claim 1, wherein a distance by which the boss extends out from the movable base is greater than a width of the flange of the product.
 9. The side punching mechanism with a movable guide block according to claim 1, wherein a counterbore is formed in each of the side wings, and a linear spring is disposed in the counterbore. 